CVE-2021-38685
QNAP
- Published
- 26 November 2021
- Last modified
- 17 June 2026
- CVSS
- 9.8 v3.1
- Severity
- critical
- EPSS
- 1.5% (72th pct)
- CISA KEV
- Not listed
- NVD status
- Modified
- Weaknesses
- CWE-78
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Description
A command injection vulnerability has been reported to affect QNAP device, VioStor. If exploited, this vulnerability allows remote attackers to run arbitrary commands. We have already fixed this vulnerability in the following versions of QVR: QVR FW 5.1.6 build 20211109 and later
Exploitation
Not listed in the CISA Known Exploited Vulnerabilities catalogue as of 2026.09.04. That is an absence of confirmed public exploitation, not evidence that exploitation has not occurred. EPSS models a 1.5% probability of exploitation activity in the next 30 days.
Affected products
| Product | Vendor | Type | Versions named |
|---|---|---|---|
| QVR | QNAP | Video management software | 5.1.6, < 5.0.0, < 5.1.5, < 5.1.6 +3 |
References
Vendor advisory and patch
- https://www.qnap.com/en/security-advisory/qsa-21-51
- https://www.qnap.com/en/security-advisory/qsa-21-51
Record assembled from NVD, CISA KEV 2026.09.04 and FIRST EPSS 2026-09-04. Affected products are those NVD's CPE configuration names that fall inside this site's scope; a CVE may affect products outside it.